Inside corner form and clamp



April 5, 1966 A. ARRIGHINI INSIDE CORNER FORM AND CLAMP 2 Sheets-Sheet 1 Filed June 6, 1965 Tm v.1 v fl/M 6 3 L E O 2 T- N v Q N v 6 NI r- M /\/q/ o 2 2 R mm H Wm m A u T R A ATTORNEYS 2 Sheets-Sheet 2 Filed June 6, 1963 INVENTOR.

ARTIL ARRIGHINI w/vizz rwdm ATTORNEY? United States PatentOfiFice 3,244,395 Patented Apr. 5, 1966 3,244,395 INSIDE CORNER FORM AND CLAMP Artil Arrighini, Southfield, Mich, assignor to Rocform Corporation, Oak Park, Mich., a corporation of Michigan Filed June 6, 1953, Ser. No. 285,924 3 Claims. (Cl. 249-194) This invention relates generally to forms for composition walls and refers more particularly to improvements in the structure provided to form the corners of a composition wall, especially the inside corners.

One of the essential objects of this invention is to provide the form with an inside corner structure rendering it possible to form a composition wall with a smooth inner surface at the corner and composed of a relatively few simple parts capable of being readily assembled and disassembled.

Another object is to provide a corner forming member adapted to extend across the space between the adjacent ends of the wall forming panels at the corner, in which the corner forming member has angularly related walls respectively overlapping and engaging the inner wall forming surfaces of the panels, and having a corner clamp operable to clamp the overlapping walls of the corner forming member firmly against the Wall forming surfaces of the panels.

Another object is to provide a corner structure for a prefabricated form in which the clamp has slidably connected first and second clamp parts, the first of which is adapted to bear against the panels with a generally inward pressure, and the second of which is adapted to engage and apply a generally outward pressure on the corner member.

Another object is to provide a clamp for the purpose described above in which the first and second parts are elongated and extend at right angles to one another.

Another object is to provide a corner forming member of generally L-shaped sheet metal construction having flanges which extend at an angle to one another and overlap the inner wall forming surfaces of the panels.

Another object is to provide a corner forming structure in which one of the elongated parts of the clamp has a hook near its inner end engageable with a hook receiving part carried by the corner forming member, and the ends of the other part of the clamp are adapted to bear against vertical pins connecting vertically spaced waler bars on the backs of the panels and to fit between and be vertically spaced by the waler bars.

Other objects and features of the invention will become apparent as the description proceeds, especially when taken in conjunction with the accompanying drawings, wherein:

FIGURE 1 is a fragmentary, horizontal sectional view of the corner of a prefabricated Wall form, according to my invention.

FIGURE 2 is a fragmentary perspective view of the inside corner structure.

FIGURE 3 is a perspective view of a clamp which forms a part of the inside corner structure.

FIGURE 4 is a top plan view of the clamp.

FIGURE 5 is an elevational view of the clamp.

FIGURE 6 is an enlarged sectional view of a portion of the clamp shown in FIGURE 5.

'the wall.

Referring now more particularly to the drawings and especially to FIGURES l and 2, the numeral 12 designates one corner of a prefabricated form used for the purpose of forming walls of composite material capable of being poured, such for example as concrete.

The corner 12 comprises an outside corner structure 14 and an inside corner structure 16. The outside corner structure 14 comprises vertical panels 18 and 20 which extend at right angles to one another. The panels 18 and 20 are formed of wood, although it will be understood that these panels may be formed of any material possessing the required strength and rigidity. In detail, each panel comprises a reinforcing frame made up of the vertical horizontally spaced studs 22, and a sheet 24 of plywood suitably secured to the inner edges of the studs 22 in order to provide a smooth uninterrupted surface. These panels 18 and 29 are connected together by a corner clamp generally indicated at 26. The corner clamp secures the panels 18 and 20 together with an end of the panel 2%) abutting the inner wall forming surface of the plywood sheet 24 of panel 18. It will be understood that additional panels may be secured to the panels 18 and 20 in end-to-end alignment to extend the length of These additional panels may be of the same construction as panels 18 and 20 and they may be clamped together end-to-end by any suitable means.

The inner surface of the composition wall is formed, at or near the corner, by the inside corner structure 16. With further reference to FIGURES l and 2, the inside corner structure will be seen to include the wall forming panels 30 and 32 which are of identical construction and like the panels 18 and 20. The panels 30 and 32 are at right angles and have the plywood sheets 34, being reinforced on the back by a frame including the vertical studs 36. The studs are spaced apart horizontally. Extending along the backs of the panels 30 and 32 are walers 38. Each panel has preferably two or more walers which extend horizontally and in vertically spaced relation. Each waler is made up of a pair of vertically spaced angle bars 40 which have vertical flanges 4-2 extending approximately in the plane of the back edges of the studs, and horizontal flanges 44 extending inwardly from the adjacent edges of the vertical flanges or toward the sheet 34. The walers are permanently secured to the studs to serve as a part of the reinforcing framework, and are preferably formed of a strong material such as iron or steel. Near the adjacent ends of panels 30 and 32, vertically extending pins 46 extend between the bars of each waler, being permanently secured to the horizontal flanges of the bars.

An elongated upright corner forming member 50 bridges the space between the adjacent ends of panels 30 and 32 and extends the full height of the panels. The corner forming member is preferably of sheet metal construction and has the flanges 52 and 54 which connect together in a smooth curve designated 56. The generally L-shaped outline of the corner forming member, shown in FIGURE 1, is uniform throughout its length. The ends of the flanges 52 and 54 overlap and engage the inner wall forming surfaces of panels 30 and 32 near their adjacent ends. Hence the corner forming member provides a smooth corner and merges smoothly with the wall forming inner surfaces of the panel sheets 34.

The corner forming member is removably clamped in position, and for this purpose clamps are provided.

Each clamp 6% includes the vertically spaced angles 62 and s4. These angles have vertical flanges 66 and 68 which are disposed in a common plane and have their adjacent edges spaced apart. The horizontal flanges 70 and 72 of the angles project from the remote edges of the flanges 66, 68 and at right angles thereto. These angles are welded or otherwise permanently secured to the laterally extending rods '74 and 76. These rods in alignment with one another and their adjacent ends are spaced apart. The welded assembly made up of the angles 62, 64 and the rods 74, 76 provide a rigid, elongated, supporting structure or brace '79 for the jaw 89 of the clamp.

The jaw 8% is an elongated flat bar which is narrower than the space between the rods 74 and 76 and thinner than the space between the adjacent edges of the angle flanges 64 and 66. Hence the adjacent edges of the vertical flanges of the angles and the adjacent ends of rods 74 and 76 provide a slot 84 through which the elongated jaw or movable clamp part 80 slides. This jaw extends at right angles to the supporting structure 79 of the clamp, that is at right angles to the aligned rods 74 and 76, and slides in the direction of its length. It has a curved inner end providing a hook 86 which is open to grip onto the anchor 88 of the corner forming member. The anchor 88 is a bar which is welded at the ends to and extends horizontally between the flanges 52 and 54 of the corner forming member.

The jaw 80 has a slot 90 through which extends a wedge 92. The small end of the wedge has a pin 94 preventing the wedge from being pulled out of the slot. When the wedge is pushed down, it withdraws the jaw in an outward direction, that is to the right in FIGURES 3-6. The jaw 86/ also has a pin 95 to prevent the jaw from being removed from slot 84.

As seen in FIGURE 2, the vertically spaced walers of one panel are horizontally aligned with the walers of the other panel, and a clamp is associated with each of the aligned pairs of walers. Each clamp engages one of the anchor pins 88. While the corner member is thus shown clamped to the panels at two vertically spaced points, obviously the corner forming member could be clamped at more than two points. While theoretically it could be clamped at only one point, this is not recommended. Filler plates are provided at the ends of the corner forming member to reinforce the same.

In use, the corner forming member will be positioned across the space between the adjacent ends of the angularly related panels and 32.. The clamps is positioned so that the rods 74 and '76 extend between the water bars of the horizontally aligned walers of each panel, in abutment with the pins 46, as shown in FIGURE 1. The jaw 8t is then hooked over the anchor pin 88 and the wedge 92 forced downward. The edges of the wedge engage the outer end of the slot 99 and the vertical flanges 66 and 63 of the angles 62 and 64 to force the jaw 80 outward.

What I claim as my invention is:

1. In a prefabricated wall form, inside wall forming means comprising a first upright panel having a wall forming surface on the inner side thereof, a second upright panel disposed at right angles with respect to the first panel and with an end of said second panel adjacent to but spaced from an end of said first panel, said second panel also having a wall forming surface on the inner side thereof, a generally V-shaped upright corner forming sheet metal member having flanges which extend at a right angle to one another and respectively overlap and engage the inner. wall forming surfaces of said panels, an elongated, straight, horizontal anchor pin extending diagonally across said corner and terminally secured to said flanges, and a corner clamp for clamping said flanges of said corner forming member firmly against said wall forming surfaces, said clamp including an elongated generally horizontal brace extending diagonally across said corner in generally parallel relation to said anchor pin, said brace engaging said panels adjacent its ends to apply a generally inward pressure thereagainst, an elongated generally horizontal jaw extending transversely of said brace and being longitudinally slidable with respect thereto, said jaw also being capable of a limited angular movement in a horizontal plane relative to said brace, said jaw extending at right angles to said anchor pin, said jaw having an inner end portion of elongated, fiat strip form of substantial width and which is disposed so that its width dimension extends horizontally, the inner end of said inner end portion curving downwardly to provide a hook of generally concave-convex form, the transverse elements of the generaly concave inner surface of said hoolc being straight and extending normal to the lengthwise dimension of said jaw, said hook engaging over the inner side of said anchor pin and the generally concave inner surface of said hook having surfaceto-surface contact with said anchor pin throughout the full width of said hook, and means for urging said jaw longitudinally in a generally outward direction to cause said hook ot apply a generally outward pull on said anchor pin and corner forming member, said jaw being held in right angle relation to said anchor pin by reason of the surface-to-surface contact of said hook throughout its full width with said anchor pin.

2. In a prefabricated wall form, inside wall forming means comprising a first upright panel having a wall forming surface on the inner side thereof, a second upright panel disposed at right angles wtih respect to the first panel, and with an end of said second panel adjacent to but spaced from an end of said first panel, said second panel also having a wall forming surface on the inner side thereof, a generally V-shaped upright corner forming sheet metal member having flanges which extend at .a right angle to one another and respectively overlap and engage the inner wall forming surfaces of said panels, an elongated, straight horizontal anchor pin extending diagonally across said corner and terminally secured to said flanges, and a corner clamp for clamping said flanges of said corner forming member firmly against said wall fiorming surfaces, said clamp including an elonagted genearlly horizontal brace extending diagonally across said corner in generally parallel relation to said anchor pin, said brace engaging said panels adjacent its ends to apply a generally inward pressure thereagainst, said brace having a horizontal slot therein intermediate its ends, an elongated horizontal jaw extending transversely of said brace, said jaw extending through said slot and being longitudinally slidable therein, said jaw also being capable of a limited angular movement in a horizontal plane relative to said slot, said jaw extending at right angles to said anchor pin, said jaw being in the form of an elongated strip of fiat stock of substantial width which is disposed so that its width dimension extends horizontally, said strip at its inner end curving downwardly in substantially semicylindrical form to provide a hook of substantial width the axis of which is normal to the lengthwise dimension of said jaw, said hook engaging over the inner side of said anchor pin and the radially inner surface of said hook having surface-to-surface contact with said anchor pin throughout the full width of said hook, a slot in the portion of said strip outwardly of said brace, and a wedge slidable in the second mentioned slot and engaging said brace for urging said strip longitudinally in a generally outward direction to cause said hook to apply a generally outward pull on said anchor pin and corner forming member, said jaw being held in right angle relation to said anchor pin by reason of the surface-to-surface contact of said hook throughout its full width with said anchor pin.

3. The structure defined in claim 2, wherein said panels have walers on their outer surfaces, said walers including vertically spaced, horizontally extending angle bars, the waler bars of the Waler on one panel being level with those of the waler on the other panel, vertical pins ex- 5 6 tending between the waler bars of said Walers near the 2,896,300 7/1959 Arrighini et a1 25131 adjacent ends of said panels, the ends of said brace ex- 3,131,453 5/1964 Stockton et a1 25131 tending between the waler bars of both Walers, sald brace FOREIGN PATENTS engaging said pins near the ends of said brace.

5 237,646 2/1962 Australia.

References Cited by the Examiner 609,268 5/1926 France- UNITED STATES PATENTS J. SPENCER OVERHOLSER, Primary Examiner. 1,394,790 10/1921 Roughsedge 25131 T 2,206,493 7/1940 Whatling 25 131 M- V- BRIND1SI, WILLIAM J. STEPHENSON, G. A.

2,526,529 10/1950 Arrighini et a1. 2s 131 10 Examiners 

1. IN A PREFABRICATED WALL FORM, INSIDE WALL FORMING MEANS COMPRISING A FIRST UPRIGHT PANEL HAVING A WALL FORMING SURFACE ON THE INNER SIDE THEREOF, A SECOND UPRIGHT PANEL DISPOSED AT RIGHT ANGLES WITH RESPECT TO THE FIRST PANEL AND WITH AN END OF SAID SECOND PANEL ADJACENT TO BUT SPACED FROM AN END OF SAID FIRST PANEL, SAID SECOND PANEL ALSO HAVING A WALL FORMING SURFACE ON THE INNER SIDE THEREOF, A GENERALLY V-SHAPED UPRIGHT CORNER FORMING SHEET METAL MEMBER HAVING FLANGES WHICH EXTEND AT A RIGHT ANGLE TO ONE ANOTHE RAND RESPECTIVELY OVERLAP AND ENGAGE THE INNER WALL FORMING SURFACES OF SAID PANELS, AN ELONGATED, STRAIGHT, HORIZONTAL ANCHOR PIN EXTENDING DIAGONALLY ACROSS SAID CORNER AND TERMINALLY SECURED TO SAID FLANGES, AND A CORNER CLAMP FOR CLAMPING SAID FLANGES OF SAID CORNER FORMING MEMBER FIRMLY AGAINST SAID WALL FORMING SURFACES, SAID CLAMP INCLUDING AN ELONGATED GENERALLY HORIZONTAL BRACE EXTENDING DIAGONALLY ACROSS SAID CORNER IN GENERALLY PARALLEL RELATION TO SAID ANCHOR PIN, SAID BRACE ENGAGING SAID PANELS ADJACENT ITS ENDS TO APPLY A GENERALLY INWARD PRESSURE THEREAGAINST, AN ELONGATED GENERALLY HORIZONTAL JAW EXTENDING TRANSVERSELY OF SAID BRACE AND BEING LONGITUDINALLY SLIDABLE WITH RE- 